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OLga [1]
2 years ago
4

Out of 100 emails, 60 are spam and 48 of those contain the word buy. Of the remaining 40 emails that are not spam, only 4 emails

contain the word buy. Given that an email is spam, what is the probability that it contains the word buy?
a.)0.80 b.) 0.87 c.) 0.92 d.) 0.97
Mathematics
2 answers:
gladu [14]2 years ago
8 0
60/100= .6
48/.6= 80
a)
stellarik [79]2 years ago
3 0

Answer:

A: 80 got it right on the test.

Step-by-step explanation:

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Austin's truck has a mass of 2000 kg when traveling at 22.0 m/s, it brakes to a stop in 4.0 s. show that the magnitude of the br
olga2289 [7]
Since F=m•a, you want to show that a = -5.5

5 0
2 years ago
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Ancient slingshots were made form straps of leather that cradled a rock until it was released. One would spin the slingshot in a
Greeley [361]
We separate equation by looking at x and y projection separately. 
Let us look at the x projection first.
Motion starts with initial velocity v_0cos(45) because there is no force acting along the x-axis we don't have any acceleration along the x-axis.  Our equation would be:
x=v_0cos(45)\cdot t
Now our y equation will be a little bit more complicated. There is gravity working against our projectile and we also have to take into effect the hight from which the projectile is launched.
With all that in mind let us write the equation for y projection:
y=h+v_0sin(45)\cdot t-g \frac{t^2}{2}
The term -g \frac{t^2}{2} represents gravity and as you can see it is negative, which means gravity is pulling our projectile down. 
There is one more thing we can do. We can express initial velocity v_0 in relation to circular motion used to launch the projectile.
v_0=w\cdot r
Where r is the length of the letter used to launch the projectile, and w is angular velocity.  
If we combine our x and y equations we can get the trajectory of our projectile.
y=h+x- \frac{gx^2}{2\cdot (wr)^2cos^2(45)}
This is the equation of a parabola. If you follow this link(https://www.desmos.com/calculator/vogcuygjhs) it will take to an interactive graph where you can see how trajectory looks like depending on some of the paramaters.
8 0
2 years ago
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The owner of a fish market determined that the mean weight for a catfish is 3.2 pounds with a standard deviation of 0.8 pound. A
madam [21]

Answer: The probability that a randomly selected catfish will weigh between 3 and 5.4 pounds is 0.596

Step-by-step explanation:

Since the weights of catfish are assumed to be normally distributed,

we would apply the formula for normal distribution which is expressed as

z = (x - µ)/σ

Where

x = weights of catfish.

µ = mean weight

σ = standard deviation

From the information given,

µ = 3.2 pounds

σ = 0.8 pound

The probability that a randomly selected catfish will weigh between 3 and 5.4 pounds is is expressed as

P(x ≤ 3 ≤ 5.4)

For x = 3

z = (3 - 3.2)/0.8 = - 0.25

Looking at the normal distribution table, the probability corresponding to the z score is 0.401

For x = 5.4

z = (5.4 - 3.2)/0.8 = 2.75

Looking at the normal distribution table, the probability corresponding to the z score is 0.997

Therefore,.

P(x ≤ 3 ≤ 5.4) = 0.997 - 0.401 = 0.596

4 0
2 years ago
How do you write 125.06 million dollars in at least four different ways.
Ludmilka [50]
$125,060,000

one-hundred twenty-five million, and sixty thousand dollars

I mean 125.06 in fraction form is 6253/50, if that works great.

125.06 million dollars, if you can use the number in the question.
5 0
2 years ago
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I've been stuck on this for so long and I have an exam soon, anybody who can help me :'( ?
san4es73 [151]
(i)  speed = distance / time
so time =  distance / speed
here we have

time t = 1080/x  hours

(ii) return flight  time  = 1080 / (x + 30)  hours

(a)  1080/x - 1080/(x + 30) = 1/2

Multiplying  through by the LCD 2x(x + 30) we get:-

1080*2(x + 30) - 2x*1080 = x(x+30)
2160x + 64800 - 2160x = x^2 + 30x
x^2 + 30x - 64800  = 0

(b)  factoring;  -64800 = 270 * -240  ans 270-240 = 30 so we have

(x + 270)(x - 240) = 0   so x = 240  ( we ignore the negative -270)

So the speed for outward journey is 240 km/hr

(c) time ffor outward flight = 1080 / 240 =  4 1/2  hours

(d) average speed for whole flight = distance / time
   Time for outward journey = 4.5 hours and time for  return journey = d / v
= 1080 / (240+30) =  4 hours
 Therefore the average speed for whole journey =  2160 / 8.5 = 254.1 km/hr
8 0
2 years ago
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